There must be a pathological reason for the suprapatellar bursa effusion, whether it is serious or not is mainly decided by the cause of the disease and whether it has serious effect on the local production. If a small amount of effusion in the suprapatellar bursa is caused by local injury or strain, generally after appropriate braking and rest and supportive symptomatic treatment, the effusion can be absorbed very quickly, and it is not very serious in this case. Some suprapatellar bursa effusion is due to intra-articular fracture caused by this hematoma, in this case due to intra-articular fracture is very serious, often lead to the knee joint to have this sequelae, so this suprapatellar bursa effusion due to fracture, comparatively speaking, should be more serious. There is also suprapatellar bursa effusion due to synovitis, arthritis, which depends on the effect on the joint. Some synovitis and arthritis are relatively mild and produce only a small amount of supratrochlear bursa effusion, which can be fully recovered after treatment, in this case it is not serious. Some synovitis and arthritis have a very severe inflammatory response, causing damage to the joints, with significant swelling, effusion, and severe pain as well as dysfunction, causing serious damage to the knee joints, in which case it is more serious. So whether or not a suprapatellar bursa effusion is serious depends primarily on the severity of the damage to the knee joint and the etiology of the condition.